Derrick-base



w. H. INSLEY A'ND A. c. RASMUSSEN.

DERRICK BASE.

APPLICATION FILED JUNE 13, 1919.

1,348,008. Patehted July 27,1920.

O 0 Hi M/ I I m r u 11 /%I l I l a: as 2/ 1x1. .4 2/ l! 217 UNITED .sT rE-s PATENT OFFICE.

WILLIAMII. INSLEY ND AL IN onAsM ssnN, orINnIANAroLIs, INDIANA, ASSIGNORS roINsLEY MANUFACTURING COMPANY, or IN AN POLIS,

I DIA A, A CORPORATION or INDIANA.

DERRICK-BASE.

Application'filed June 13, 1919. Serial No. 304,030.

To all whom it may concern:

Be it known that we, WILLIAM .H. INSLEY and ALVIN C. RAsMUssE citizens of the United States residing at Indianapolis, in the county of Marion and State of Indiana, have invented a new .andiusef'ul Derrick- Base, of which the following is a specification.

The object of our invention is to produce at low cost a simple and effective base for the rotatable mast of derricks such as are in common use for hoisting, transferring and placing building materials, etc.

The accompanying drawings illustrate our invention. Figure 1 is a vertical section of a device embodying our invention; Fig. 2 a plan of the main base casting; Fig. 3 a plan of the intermediate step casting; and Fig. 4 a plan of the mast-foot casting.

In the drawings, the main base casting, preferably of cast iron, comprises a base plate 11, a cylindrical vertical flange 12, a horizontal top flange 13 and suitable bracing ribs 14. The inner surface of flange 12, near its upper end, is provided with a machined, cylindrical wearing surface 15, and coaxial with this wearing surface, is a ma chined wearing surface 16 on the upper surface of a rib forming part of plate 11 within flange 12.

Fitted within flange 12 is the intermediate step-casting 20 which is preferably a steelcasting. At its bottom, step 20 is provided with a machined annular wearing surface 21, formed to rest upon surface 16. Step 20 is also provided with a machined cylindrical surface 22, at its upper outer corner, which fits within surface 15 of flange 12. Internally step 20 is provided with an upwardly presented socket 23 which is a segment of a sphere conveniently formed by casting and not needing to be accurately machined.

Between the bearing surfaces 21 and 22, the step-casting does not fill the lower corner of the well formed by flange 12 and there is thus formed an oil chamber which may be filled through pipe 24. In order to conveniently obtain a proper distribution of lubricant, surfaces 21 and 22 are traversed, at various points, by shallow grooves 21' and 22, respectively, and passages 25 lead up through the body of the casting with socket 23.

The mast-foot casting is preferably of cast ironand comprises an annular lower portion 30, the bottom face of which is a spherlcal segment fairly fitting socket 23.

This face does not have to be accurately -mach1ned. The mast-foot casting also comprises an outwardly extending peripheral flange 31 and an upper portion 32 formed to receive a suitable derrick-mast, either of wood or fabricated metal.

Bolted upon flange 13 are ring segments.

35 which project over the step-casting and portion 30 of the foot-casting, and project beneath flange 31, thus locking the parts together while permitting universal adjustment, through a desired range, of the mastfoot' in the step-casting, and rotation of the step-casting in the base casting.

The main wearing surfaces are either plane or cylindrical and therefore easily produced in highly finished form, while the ball-and-socket support for the mast, permitting that degree of flexibility which is desirable because of the practical inability of ordinary workmen to set and maintain the base casting with its axis in absolute coincidence with the axis of the mast, may have mating surfaces which need not be machined. This is important because the machining of spherical segments is a very expensive operation.

We claim as our invention:

1. A derrick-base comprising a base member of cast iron forming a well provided with a substantially horizontal wearing face and a cylindrical substantially vertical wearing face; an intermediate step member of cast steel mounted in the well and provided with a substantially horizontal wearing face and a cylindrical substantially vertical wearing face, and an upwardly-presented spherical-segment socket; a mastfoot niember of cast iron, having a mastreceiving upper end and a lower end carrying a spherical segment seated in the socket of the step member, and means for preventing undue displacement of said parts.

2. A derrick-base comprising a base member forming a well provided with a substantially horizontal wearing face and a cylindrical substantially vertical wearing face;

an intermediate step member mounted in receiving upper end and a lower endcarrya mg a spherical segment seated in the socket of the'step member, and means for preventing undue displacement of said parts.

3. A'derrick-base comprising a base member of cast iron forming a Well provided with l a substantially horizontal l Wearing face and a cylindrical substantially vertical wearing face; an intermediate step member of cast iron mounted invthe Well and pro- Jvided with a substantially horizontal WearingIface and a cylindricalsubstantially verreceiving upper end anda lo,Wer end carrying a spherical segment seated in the socket of the step member. 2 4L. VAde rick-base.compr sing abase I ber forming a Well provided with a substant ally horizontal Wearing face and a cylindrica'l substantially vertical Wearing face;

an intermediate step membermounted in the 30 Well and provided With a substantially our hands at Indianapolis, Indiana, this 4 

